11889022781 has 2 divisors, whose sum is σ = 11889022782. Its totient is φ = 11889022780.

The previous prime is 11889022771. The next prime is 11889022813. The reversal of 11889022781 is 18722098811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11606614756 + 282408025 = 107734^2 + 16805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11889022781 is a prime.

It is a super-2 number, since 2×11889022781² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11889022721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5944511390 + 5944511391.

It is an arithmetic number, because the mean of its divisors is an integer number (5944511391).

Almost surely, 2^11889022781 is an apocalyptic number.

It is an amenable number.

11889022781 is a deficient number, since it is larger than the sum of its proper divisors (1).

11889022781 is an equidigital number, since it uses as much as digits as its factorization.

11889022781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 47.

The spelling of 11889022781 in words is "eleven billion, eight hundred eighty-nine million, twenty-two thousand, seven hundred eighty-one".